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Author Topic: pH sensor, Salinity sensor and Dissolved Oxygen sensor.  (Read 8964 times)
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Is it possible to make those sensors using Arduino? And can you use just one Arduino board for all those sensors? And I'm also beginner on Arduino and programming.
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Is it possible to make those sensors using Arduino? And can you use just one Arduino board for all those sensors? And I'm also beginner on Arduino and programming.
Yes i think. In two words. First you need to find a data-sheet of you sensor (probe). Then you can connect probe directly to your arduino board. Or first make a little intermediate board to regulate your current tension etc. But i think in most of probe (sensor) you can find already intermediate board (look the price).
For example.
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You can connect (most) existing sensors to the Arduino, you should look at the voltage level of course.
PH - there exists a nice sensor from atlas scientific which is discussed on the forum many times (google arduino ph atlas scientific)
Salinity - I think by measuring resistance of the water?
Oxygen - ?

you could be inspired by this - http://nznano.blogspot.nl/2011/12/homemade-spectrometerspectrophotometer.html -
(there are more spectrometers out there)
DOn't know how well they will detect dissolved atoms...
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Thanks for your replies. I guess I'll have to learn more about Arduino then
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Quote
Is it possible to make those sensors using Arduino?

What do you mean by this ?

If you have got a sensor from somewhere,   it is almost certainly possible to use it with an arduino.  The exception may be some sensors which use high voltage.

But can you "make" these sensors with an arduino ?   Like "make your own" ?  Probably not.  The operating principles of these sensors are not simple and require materials and fabrication techniques that you probably don't have.

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What you can do with the Arduino that is very useful is to receive signals from these probes/circuits and make them available for display, data archiving and control.

There are a number of folks doing things with these probes to control their aquariums. Just search on Aquariums. I've seen handmade ph, temperature and conductivity probes. I recall one user that has even custom built PH, ORP and Conductivity Shields. (search Arduarium)

BTW, Salinity can be calculated from a conductivity probe.  In fact, Conductivity, Salinity and Total Dessolved Solids can be derived together.

Atlas Scientific has nice stuff (I am using it for two projects that involve Arduino for prototyping). It is expensive, but is pretty much system agnostic (they standardized on serial communications to interface with their sensor/circuitboard combos.)
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Conductivity is easy to measure.   You can easily calculate a dissolved salt amount which is equivalent to that,   provided you are happy to assume that the conductivity is caused by salt and not by something else.
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